Render has gray spots all over it
You could do these things:

You probably have too little samples in your render. Increase your samples and re-Render.

Render with &quot;Denoising Data&quot; or if you have it enabled, render without.


If you render with the old denoiser, render with the Intel Open Denoiser (The node in the compositor)

If that doesn`t help, please post a render without denoising.